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        <title>我在B站玩編程</title>
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    <body>
        <nav class="navbar navbar-expand-lg bg-dark navbar-dark fixed-top">
            <div class="container">
                <a href="#" class="navbar-brand">我在B站玩编程</a>

                <button
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                    type="button"
                    data-bs-toggle="collapse"
                    data-bs-target="#navmenu"
                >
                    <span class="navbar-toggler-icon"></span>
                </button>

                <div class="collapse navbar-collapse" id="navmenu">
                    <ul class="navbar-nav ms-auto">
                        <!--margin start = margin left-->
                        <li class="nav-item">
                            <div class="nav-link">前端知识</div>
                        </li>
                        <li class="nav-item">
                            <div class="nav-link">后端知识</div>
                        </li>
                        <li class="nav-item">
                            <div class="nav-link">数据库知识</div>
                        </li>
                    </ul>
                </div>
            </div>
        </nav>

        <section class="p-5 bg-dark text-light text-center text-sm-start">
            <!--padding -->
            <div class="container">
                <div class="d-flex">
                    <!--display flex-->
                    <div>
                        <h1>
                            成为一个<span class="text-warning">前端工程师</span>
                        </h1>
                        <p class="my-4">
                            <!-- margin-top margin-bottom -->
                            Lorem ipsum, dolor sit amet consectetur adipisicing
                            elit. Doloremque corporis quo, similique perferendis
                            distinctio non eius consequuntur error obcaecati
                            quaerat iusto quos fugiat rerum, unde omnis
                            blanditiis ducimus asperiores quibusdam? Maiores nam
                            deserunt earum exercitationem eligendi,
                        </p>
                        <button class="btn btn-primary btn-lg">
                            开始编程之旅
                        </button>
                    </div>
                    <img
                        src="./img/showcase.svg"
                        alt="showcase"
                        class="w-50 d-none d-md-block"
                    />
                </div>
            </div>
        </section>

        <section class="p-5 bg-primary text-light">
            <div class="container">
                <div
                    class="d-md-flex justify-content-between align-items-center"
                >
                    <h3 class="mb-3">现在注册账号开始编程之旅</h3>
                    <div class="input-group news-input">
                        <input
                            type="text"
                            class="form-control"
                            placeholder="请输入你的邮箱"
                        />
                        <button class="btn btn-dark btn-lg">注册</button>
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5">
            <div class="container">
                <div class="row g-4">
                    <!--gap-->
                    <div class="col-md">
                        <div class="card bg-dark text-light">
                            <div class="card-body text-center">
                                <div class="card-title">前端知识</div>
                                <div class="card-text">
                                    Lorem ipsum dolor sit amet consectetur,
                                    adipisicing elit. Minus voluptatibus
                                    consequuntur vitae quo quibusdam
                                </div>
                                <a href="#" class="btn btn-primary mt-2"
                                    >学习前端</a
                                >
                            </div>
                        </div>
                    </div>
                    <div class="col-md">
                        <div class="card bg-secondary text-light">
                            <div class="card-body text-center">
                                <div class="card-title">前端知识</div>
                                <div class="card-text">
                                    Lorem ipsum dolor sit amet consectetur,
                                    adipisicing elit. Minus voluptatibus
                                    consequuntur vitae quo quibusdam
                                </div>
                                <a href="#" class="btn btn-primary mt-2"
                                    >学习前端</a
                                >
                            </div>
                        </div>
                    </div>
                    <div class="col-md">
                        <div class="card bg-dark text-light">
                            <div class="card-body text-center">
                                <div class="card-title">前端知识</div>
                                <div class="card-text">
                                    Lorem ipsum dolor sit amet consectetur,
                                    adipisicing elit. Minus voluptatibus
                                    consequuntur vitae quo quibusdam
                                </div>
                                <a href="#" class="btn btn-primary mt-2"
                                    >学习前端</a
                                >
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5">
            <div class="container">
                <div class="row align-items-center justify-content-between">
                    <div class="col-md">
                        <img src="img/1.svg" alt="1" class="img-fluid" />
                    </div>
                    <div class="col-md p-5">
                        <h2>课程介绍</h2>
                        <p class="lead">
                            Lorem ipsum, dolor sit amet consectetur adipisicing
                            elit. Praesentium ea ratione corporis et provident.
                            Quia!
                        </p>
                        <p>
                            Lorem, ipsum dolor sit amet consectetur adipisicing
                            elit. Amet nostrum, aperiam assumenda vitae, beatae
                            at sint quaerat consequatur maxime, hic voluptatum
                            ex. Dolor minus perferendis magni autem
                            exercitationem quis quos.
                        </p>
                        <a href="" class="btn btn-light">查看更多</a>
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5 bg-dark text-light">
            <div class="container">
                <div class="row align-items-center justify-content-between">
                    <div class="col-md p-5">
                        <h2>课程介绍</h2>
                        <p class="lead">
                            Lorem ipsum, dolor sit amet consectetur adipisicing
                            elit. Praesentium ea ratione corporis et provident.
                            Quia!
                        </p>
                        <p>
                            Lorem, ipsum dolor sit amet consectetur adipisicing
                            elit. Amet nostrum, aperiam assumenda vitae, beatae
                            at sint quaerat consequatur maxime, hic voluptatum
                            ex. Dolor minus perferendis magni autem
                            exercitationem quis quos.
                        </p>
                        <a href="" class="btn btn-light">查看更多</a>
                    </div>

                    <div class="col-md">
                        <img src="img/2.svg" alt="1" class="img-fluid" />
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5">
            <div class="container">
                <h2 class="text-center">常见问题</h2>
                <div
                    class="accordion accordion-flush"
                    id="accordionFlushExample"
                >
                    <div class="accordion-item">
                        <h2 class="accordion-header" id="flush-headingOne">
                            <button
                                class="accordion-button collapsed"
                                type="button"
                                data-bs-toggle="collapse"
                                data-bs-target="#flush-collapseOne"
                                aria-expanded="false"
                                aria-controls="flush-collapseOne"
                            >
                                Accordion Item #1
                            </button>
                        </h2>
                        <div
                            id="flush-collapseOne"
                            class="accordion-collapse collapse show"
                            aria-labelledby="flush-headingOne"
                            data-bs-parent="#accordionFlushExample"
                        >
                            <div class="accordion-body">
                                Placeholder content for this accordion, which is
                                intended to demonstrate the
                                <code>.accordion-flush</code> class. This is the
                                first item's accordion body.
                            </div>
                        </div>
                    </div>
                    <div class="accordion-item">
                        <h2 class="accordion-header" id="flush-headingTwo">
                            <button
                                class="accordion-button collapsed"
                                type="button"
                                data-bs-toggle="collapse"
                                data-bs-target="#flush-collapseTwo"
                                aria-expanded="false"
                                aria-controls="flush-collapseTwo"
                            >
                                Accordion Item #2
                            </button>
                        </h2>
                        <div
                            id="flush-collapseTwo"
                            class="accordion-collapse collapse"
                            aria-labelledby="flush-headingTwo"
                            data-bs-parent="#accordionFlushExample"
                        >
                            <div class="accordion-body">
                                Placeholder content for this accordion, which is
                                intended to demonstrate the
                                <code>.accordion-flush</code> class. This is the
                                second item's accordion body. Let's imagine this
                                being filled with some actual content.
                            </div>
                        </div>
                    </div>
                    <div class="accordion-item">
                        <h2 class="accordion-header" id="flush-headingThree">
                            <button
                                class="accordion-button collapsed"
                                type="button"
                                data-bs-toggle="collapse"
                                data-bs-target="#flush-collapseThree"
                                aria-expanded="false"
                                aria-controls="flush-collapseThree"
                            >
                                Accordion Item #3
                            </button>
                        </h2>
                        <div
                            id="flush-collapseThree"
                            class="accordion-collapse collapse"
                            aria-labelledby="flush-headingThree"
                            data-bs-parent="#accordionFlushExample"
                        >
                            <div class="accordion-body">
                                Placeholder content for this accordion, which is
                                intended to demonstrate the
                                <code>.accordion-flush</code> class. This is the
                                third item's accordion body. Nothing more
                                exciting happening here in terms of content, but
                                just filling up the space to make it look, at
                                least at first glance, a bit more representative
                                of how this would look in a real-world
                                application.
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5 bg-primary">
            <div class="container">
                <h2 class="text-center text-light">讲师介绍</h2>
                <p class="lead text-center text-white mb-5">
                    Lorem ipsum, dolor sit amet consectetur adipisicing elit.
                    Hic, unde?
                </p>
                <div class="row g-4">
                    <div class="col-md-6 col-lg-3">
                        <div class="card bg-light">
                            <div class="card-body text-center">
                                <img src="img/01-man.jpeg" class="mb-3 rounded-circle"/>
                                <h3 class="card-title">刘德华</h3>
                                <p class="card-text">
                                    Lorem ipsum dolor sit amet consectetur
                                    adipisicing elit. Accusamus, ratione!
                                </p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-6 col-lg-3">
                        <div class="card bg-light">
                            <div class="card-body text-center">
                                <img src="img/02-man.jpeg" class="mb-3 rounded-circle"/>
                                <h3 class="card-title">黎明</h3>
                                <p class="card-text">
                                    Lorem ipsum dolor sit amet consectetur
                                    adipisicing elit. Accusamus, ratione!
                                </p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-6 col-lg-3">
                        <div class="card bg-light">
                            <div class="card-body text-center">
                                <img src="img/03-man.jpeg" class="mb-3 rounded-circle"/>
                                <h3 class="card-title">张学友</h3>
                                <p class="card-text">
                                    Lorem ipsum dolor sit amet consectetur
                                    adipisicing elit. Accusamus, ratione!
                                </p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-6 col-lg-3">
                        <div class="card bg-light">
                            <div class="card-body text-center">
                                <img src="img/01-man.jpeg" class="mb-3 rounded-circle"/>
                                <h3 class="card-title">郭富城</h3>
                                <p class="card-text">
                                    Lorem ipsum dolor sit amet consectetur
                                    adipisicing elit. Accusamus, ratione!
                                </p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <section class="p-5">
            <div class="container">
                <h2 class="text-center mb-4">联系我们</h2>

                <ul class="list-group list-group-flush">
                    <li class="list-group-item">电话：1008611111</li>
                    <li class="list-group-item">邮箱： bilibil@bili.com</li>
                    <li class="list-group-item">地址：广东省珠海市、、、</li>
                  </ul>
            </div>
        </section>

        <footer class="p-5 bg-dark text-white text-center">
            <div class="container">
                <p class="lead">Copyright &copy; 2023 我在B站玩編程</p>
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